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1da177e4 LT |
1 | #ifndef _ASM_IA64_RSE_H |
2 | #define _ASM_IA64_RSE_H | |
3 | ||
4 | /* | |
5 | * Copyright (C) 1998, 1999 Hewlett-Packard Co | |
6 | * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com> | |
7 | * | |
8 | * Register stack engine related helper functions. This file may be | |
9 | * used in applications, so be careful about the name-space and give | |
10 | * some consideration to non-GNU C compilers (though __inline__ is | |
11 | * fine). | |
12 | */ | |
13 | ||
14 | static __inline__ unsigned long | |
15 | ia64_rse_slot_num (unsigned long *addr) | |
16 | { | |
17 | return (((unsigned long) addr) >> 3) & 0x3f; | |
18 | } | |
19 | ||
20 | /* | |
21 | * Return TRUE if ADDR is the address of an RNAT slot. | |
22 | */ | |
23 | static __inline__ unsigned long | |
24 | ia64_rse_is_rnat_slot (unsigned long *addr) | |
25 | { | |
26 | return ia64_rse_slot_num(addr) == 0x3f; | |
27 | } | |
28 | ||
29 | /* | |
30 | * Returns the address of the RNAT slot that covers the slot at | |
31 | * address SLOT_ADDR. | |
32 | */ | |
33 | static __inline__ unsigned long * | |
34 | ia64_rse_rnat_addr (unsigned long *slot_addr) | |
35 | { | |
36 | return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3)); | |
37 | } | |
38 | ||
39 | /* | |
40 | * Calculate the number of registers in the dirty partition starting at BSPSTORE and | |
41 | * ending at BSP. This isn't simply (BSP-BSPSTORE)/8 because every 64th slot stores | |
42 | * ar.rnat. | |
43 | */ | |
44 | static __inline__ unsigned long | |
45 | ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp) | |
46 | { | |
47 | unsigned long slots = (bsp - bspstore); | |
48 | ||
49 | return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40; | |
50 | } | |
51 | ||
52 | /* | |
53 | * The inverse of the above: given bspstore and the number of | |
54 | * registers, calculate ar.bsp. | |
55 | */ | |
56 | static __inline__ unsigned long * | |
57 | ia64_rse_skip_regs (unsigned long *addr, long num_regs) | |
58 | { | |
59 | long delta = ia64_rse_slot_num(addr) + num_regs; | |
60 | ||
61 | if (num_regs < 0) | |
62 | delta -= 0x3e; | |
63 | return addr + num_regs + delta/0x3f; | |
64 | } | |
65 | ||
66 | #endif /* _ASM_IA64_RSE_H */ |